投资 · 西方古典
大卫·李嘉图：政治经济学及赋税原理·摘录 69
大卫·李嘉图《政治经济学及赋税原理》· On the Principles of Political Economy and Taxation · 投资
Like every other commodity, the value of the metals is subject to variation. Improvements may be made in the implements and machinery used in mining, which may considerably abridge labour; new and more productive mines may be discovered, in which, with the same labour, more metal may be obtained; or the facilities of bringing it to market may be increased. In either of these cases the metals would fall in value, and would therefore exchange for a less quantity of other things. On the other hand, from the increasing difficulty of obtaining the metal, occasioned by the greater depth at which the mine must be worked, and the accumulation of water, or any other contingency, its value, compared with that of other things, might be considerably increased.
出处：
https://www.gutenberg.org/ebooks/33310
定位：Excerpt 69 · 核对日期：2026-10-19 · 核验：短摘录
白话
金属和别的商品一样，价值会变动。采矿工具和机器改进，能省下不少劳动；发现新的更富的矿，同样劳动能产出更多金属；运输变得更方便，也会让金属贬值，能换到的东西变少。反过来，矿越挖越深、积水增多或其他意外，使取得金属越来越难，它的价值相对其他东西就可能明显上升。所以金属的价值不是固定的，会随生产条件变化而涨落。
上下文
李嘉图讨论贵金属价值变动的原因，为后面说明货币作为价值尺度的不稳定性做铺垫。
今日一问
你手里的钱或资产，其购买力会因生产条件变化而波动，你有没有为此做长期打算？
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